Abstract
It is shown the electrolyte composition and electrodeposition conditions in view of “black nickel” coatings obtaining on the surface of piece from alloyed steel, including into the inner surface of small diame- ter hole (3.4 – 5.0 mm). The used method of coatings obtaining include the application of two regimes of electrodeposition from one bath which contain the nickel and zinc salts, precursor of complex (ammonium thiocyanate) and boric acid. The first regime gives the possibility to obtain fine-grained layer with high con- centration of nickel and the second – (functional) has been deposited with high concentration of zinc. The produced coatings contained also oxides and sulphides and were amorphous as was X-ray analysis shown.